Need help with Our World Underwater contest

I uploaded several photos, and when I opened the pay window, I only was given one option to pay, Google Wallet.

I've never heard of Google Wallet. I did everything i could think of to try to sign up and pay, and could not get it to work. The best I could manage was to get to a screen where it said "processing", where it froze.

Very, very frustrating after spending over an hour uploading photos.

Can somebody lend a hand? I sure hope I don't have to start the entire process over.

Thanks.

Update, I was using the latest version of Firefox on Mac, and I could not pay. I went through the payment process again using Safari and was successful (I tihink).

Just FYI.

I didn't have any problems with it...except for wondering how Google already knows my credit card number when I swear I haven't used it before. Then I remembered that Google knows everything, relaxed and clicked pay. Seemed to work.